CN116333468B - Heat-shrinkage-resistant high-flow polylactic acid material - Google Patents
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- 229920000747 poly(lactic acid) Polymers 0.000 title claims abstract description 38
- 239000004626 polylactic acid Substances 0.000 title claims abstract description 38
- 239000000463 material Substances 0.000 title claims abstract description 22
- 239000004744 fabric Substances 0.000 claims abstract description 23
- 229920001661 Chitosan Polymers 0.000 claims abstract description 15
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 12
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 11
- 238000004132 cross linking Methods 0.000 claims abstract description 10
- 239000002667 nucleating agent Substances 0.000 claims abstract description 9
- 239000004750 melt-blown nonwoven Substances 0.000 claims abstract description 7
- 238000010894 electron beam technology Methods 0.000 claims abstract description 5
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 6
- JVTAAEKCZFNVCJ-REOHCLBHSA-N L-lactic acid Chemical compound C[C@H](O)C(O)=O JVTAAEKCZFNVCJ-REOHCLBHSA-N 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- 239000008187 granular material Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 229920001432 poly(L-lactide) Polymers 0.000 claims description 4
- 238000009987 spinning Methods 0.000 claims description 4
- 150000001408 amides Chemical class 0.000 claims description 3
- 230000006196 deacetylation Effects 0.000 claims description 3
- 238000003381 deacetylation reaction Methods 0.000 claims description 3
- 239000004745 nonwoven fabric Substances 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000002425 crystallisation Methods 0.000 claims description 2
- 230000008025 crystallization Effects 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 2
- 230000001737 promoting effect Effects 0.000 claims description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims 4
- 239000004310 lactic acid Substances 0.000 claims 2
- 235000014655 lactic acid Nutrition 0.000 claims 2
- 239000000314 lubricant Substances 0.000 claims 2
- 238000006068 polycondensation reaction Methods 0.000 claims 2
- 229920001896 polybutyrate Polymers 0.000 claims 1
- 230000005855 radiation Effects 0.000 claims 1
- 238000002156 mixing Methods 0.000 abstract description 6
- 150000007524 organic acids Chemical class 0.000 abstract description 5
- 239000012745 toughening agent Substances 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 11
- 238000012360 testing method Methods 0.000 description 10
- YASYEJJMZJALEJ-UHFFFAOYSA-N Citric acid monohydrate Chemical compound O.OC(=O)CC(O)(C(O)=O)CC(O)=O YASYEJJMZJALEJ-UHFFFAOYSA-N 0.000 description 8
- 229960004106 citric acid Drugs 0.000 description 8
- 229960002303 citric acid monohydrate Drugs 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000000047 product Substances 0.000 description 5
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- -1 isocyanate compound Chemical class 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000000844 anti-bacterial effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 229920002961 polybutylene succinate Polymers 0.000 description 2
- 239000004631 polybutylene succinate Substances 0.000 description 2
- 229920001610 polycaprolactone Polymers 0.000 description 2
- 239000004632 polycaprolactone Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- TXUICONDJPYNPY-UHFFFAOYSA-N (1,10,13-trimethyl-3-oxo-4,5,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-17-yl) heptanoate Chemical compound C1CC2CC(=O)C=C(C)C2(C)C2C1C1CCC(OC(=O)CCCCCC)C1(C)CC2 TXUICONDJPYNPY-UHFFFAOYSA-N 0.000 description 1
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- LNYGCDOWFJXOSW-UHFFFAOYSA-N 1-n,3-n,5-n-tricyclohexylbenzene-1,3,5-tricarboxamide Chemical compound C=1C(C(=O)NC2CCCCC2)=CC(C(=O)NC2CCCCC2)=CC=1C(=O)NC1CCCCC1 LNYGCDOWFJXOSW-UHFFFAOYSA-N 0.000 description 1
- RBMHUYBJIYNRLY-UHFFFAOYSA-N 2-[(1-carboxy-1-hydroxyethyl)-hydroxyphosphoryl]-2-hydroxypropanoic acid Chemical compound OC(=O)C(O)(C)P(O)(=O)C(C)(O)C(O)=O RBMHUYBJIYNRLY-UHFFFAOYSA-N 0.000 description 1
- WSQZNZLOZXSBHA-UHFFFAOYSA-N 3,8-dioxabicyclo[8.2.2]tetradeca-1(12),10,13-triene-2,9-dione Chemical compound O=C1OCCCCOC(=O)C2=CC=C1C=C2 WSQZNZLOZXSBHA-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910021626 Tin(II) chloride Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 150000004676 glycans Polymers 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- SNVLJLYUUXKWOJ-UHFFFAOYSA-N methylidenecarbene Chemical group C=[C] SNVLJLYUUXKWOJ-UHFFFAOYSA-N 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 229920001434 poly(D-lactide) Polymers 0.000 description 1
- 229920005586 poly(adipic acid) Polymers 0.000 description 1
- 239000005014 poly(hydroxyalkanoate) Substances 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 150000004804 polysaccharides Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000001119 stannous chloride Substances 0.000 description 1
- 235000011150 stannous chloride Nutrition 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Abstract
The invention discloses a preparation method and application of heat-resistant shrinkage high-flow polylactic acid, which have good fluidity and good heat shrinkage resistance and are applied to the field of melt-blown non-woven fabrics. The material comprises the following components in parts by weight: 46-97 parts of polylactic acid, 1-40 parts of toughening agent, 0.1-2 parts of antioxidant, 0.1-3 parts of nucleating agent, 1-5 parts of natural organic acid and 0.5-4 parts of chitosan. And (5) carrying out melt blending by a double-screw extruder to obtain the high-flow mixed material. The mixed material is made into melt-blown cloth, and after electron beam irradiation crosslinking, the melt-blown cloth has good heat shrinkage resistance.
Description
Technical Field
The invention relates to modified polylactic acid, which has high fluidity, can be applied to the field of melt-blown non-woven fabrics, and the prepared non-woven fabrics have good heat-resistant shrinkage performance.
Background
Polylactic acid, also called polylactide, is synthesized by chemical method from starch extracted from plant resources as raw material, and can be completely degraded into carbon dioxide and water, which is very beneficial to environment, and can reduce the dependence of people on petroleum resources. Polylactic acid has good mechanical properties, and can achieve good antibacterial effect due to the fact that the polylactic acid is acidic. In the field of melt-blown nonwovens, good flowability of raw materials is required, but at present, polylactic acid with high melt index in the market is less, and most of the polylactic acid is below 100 g/10 min. In addition, polylactic acid has only one side methylene carbon atom between molecular chain ester bonds due to the structural characteristics of the polylactic acid, the molecular chain is in a spiral structure, and the movement of the molecular chain is limited, so that the polylactic acid is difficult to crystallize, and can be heated to have great thermal contraction after spinning, so that the application range of the material is limited.
The invention patent with publication number CN 110396289A discloses a polylactic acid resin with ultra-high melt index, a preparation method and application thereof, which comprises the steps of dissolving stannous chloride or tetrabutyl titanate serving as a catalyst, a peroxide initiator and an antioxidant into a methylene dichloride solvent, mixing with polylactic acid with high molecular weight, adding into an extruder with length-diameter ratio of 1:44, carrying out reaction extrusion at 160-190 ℃, and obtaining polylactic acid with melt index of more than 300g/10min by adjusting the rotating speed of different screws and the addition amount of additives. Although polylactic acid with high melt index can be obtained by the method, the methylene dichloride solvent, the catalyst and the peroxide used have risks of environmental pollution and poisoning, and residues are also remained in the final product. The invention patent with publication number CN 115012058A discloses a preparation method and application of heat-resistant high-fluidity polylactic acid, which uses high-energy rays such as X-rays, electron beams or gamma rays to irradiate the polylactic acid to break the chain to increase fluidity, and then performs secondary irradiation crosslinking on a product prepared from the irradiated material. Although the method can obtain a product with certain heat resistance, the method needs to be subjected to two times of irradiation, the process is relatively complicated, and an isocyanate compound and a propenyl compound are required to be added as a cross-linking agent when the second irradiation cross-linking is carried out, so that the product has toxicity and has certain residue. The invention patent with publication number CN 114989590A discloses a method for improving fluidity by using modified PVA and glycerin to obtain ultra-high fluidity polylactic acid, but the method does not consider the final heat resistance of the product.
Disclosure of Invention
Aiming at the problems, the invention provides a high-flow heat-resistant condensed polylactic acid material which is relatively simple in process, nontoxic and residue-free, and can be applied to the field of melt-blown non-woven fabrics. Firstly, preparing high-fluidity polylactic acid blending granules with uniform and stable performance by using natural organic acid through a melt blending modification method; and preparing melt-blown cloth from the obtained high-fluidity polylactic acid blending granules through a melt-blowing process, rolling, and carrying out micro-crosslinking on the melt-blown cloth through irradiation treatment of an electron accelerator to obtain a product with good heat resistance.
The high-fluidity heat-resistant shrinkage polylactic acid material comprises the following raw materials in parts by weight:
Polylactic acid: 46-97 parts
Toughening agent: 1-40 parts
An antioxidant: 0.1-2 parts
Nucleating agent: 0.1-3 parts
Natural organic acids: 1-5 parts
Chitosan: 0.5-4 parts
The polylactic acid is one or the combination of two of commercialized PLLA and PDLA.
The toughening agent is one or more than two of polybutylene succinate (PBS), polybutylene adipate/terephthalate (PBAT), polycaprolactone (PCL) and Polyhydroxyalkanoate (PHA).
The nucleating agent is an organic or inorganic substance such as an amide derivative, a hydrazide compound, talcum powder and the like capable of promoting the rapid crystallization of polylactic acid, and can be one or a combination of more than two of the substances.
The antioxidant is hindered phenol main antioxidant and phosphite antioxidant, such as 1010, 168, etc.
The natural organic acid is one or the combination of citric acid and malic acid.
The materials are evenly mixed according to a certain proportion, then melt-mixed through a double-screw extruder to obtain crosslinkable high-fluidity granules, and the obtained granules are melt-blown to prepare the melt-blown non-woven fabric. And carrying out irradiation crosslinking treatment on the non-woven fabric to finally obtain the heat-shrinkage-resistant melt-blown fabric. The irradiation mode is X-ray, electron beam or gamma ray.
In order to better solve the technical problems and obtain better performance, the invention preferably adopts the following scheme:
Preferably, the polylactic acid melt is PLLA with the concentration of 5-20 g/10 min;
preferably, the toughening agent is poly (adipic acid)/butylene terephthalate (PBAT);
preferably, the nucleating agent is a compound of an amide derivative and a hydrazide compound;
Preferably, the natural organic acid is citric acid;
preferably, the deacetylation degree of the chitosan is more than or equal to 87%.
Under the condition that the raw materials are preferable, the high-fluidity polylactic acid preferably comprises the following raw materials in parts by weight:
PLLA:62-86 parts
PBAT:10-30 parts
An antioxidant: 0.2-0.5 part
Nucleating agent: 0.5-1.5 parts
Citric acid: 2-4 parts
Chitosan: 1-3 parts
Preferably, a 10MeV electron accelerator is used, and the irradiation dose is 30-50KGy.
Compared with the prior art, the invention has the following advantages:
According to the invention, citric acid is added to enable the polylactic acid to perform partial chain breakage in an acidic environment, so that good fluidity is achieved, and micro-crosslinking is completed under low irradiation dose through the action between the citric acid and-NH 3 + on chitosan chains, and a network structure is formed in the polylactic acid, so that good heat-resistant shrinkage performance is realized. The citric acid and chitosan added in the process are natural organic matters, and are nontoxic and harmless, wherein the chitosan also has a good antibacterial effect.
Detailed Description
The invention will be further illustrated with reference to specific examples. These examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. All the raw materials used in the following examples and comparative examples are commercially available, except for the specific descriptions.
The raw material information and auxiliary agent information used in the examples and comparative examples are as follows:
Polylactic acid (PLA): 4032D Nature orks, L130 Darling Ke Bien;
PBAT: TH801T, blue mountain river;
nucleating agent: TMC-328, TMC-300, shanxi chemical industry;
an antioxidant: 1010, 168;
citric acid, citric acid monohydrate, yingxuan;
chitosan: the deacetylation degree is more than or equal to 87 percent, and the biological activity is green.
The material performance characterization method comprises the following steps:
Melt index, 210 ℃,2.16kg. Drying before testing, and controlling the moisture below 0.05%. Average diameter of fiber: and carrying out melt-blowing verification on the obtained material, and calculating the average diameter of the spinneret fiber under a normal process. Tensile strain at break: cutting 30mm sample strips from the melt-blown fabric, carrying out testing at a span of 80mm and a testing speed of 100mm/min for 5 pieces longitudinally and transversely, and taking an average value; heat resistance test of meltblown cloth: the test specimens were 100mm in size, placed in a 75℃water bath for 10min, and tested for the ratio of the transverse and longitudinal shrinkage dimensions.
The corresponding materials are weighed according to the formula proportion in the table 1, and are added into a double-screw extruder for melt blending after being uniformly mixed, wherein the temperature of the extruder is as follows: 180-220 ℃, then bracing, cooling and granulating for melt finger test; and then carrying out melt-blowing spinning on the obtained particles, wherein the melt-blowing spinning temperature is set: 170-220 ℃, hot air temperature: 260-280 ℃, drafting wind pressure: 0.02-0.03MPa, and testing the fiber diameter; sampling from the melt-blown fabric to perform a tensile strain at break test; then unreeling the melt-blown fabric for electron beam irradiation, wherein the irradiation dose is as follows: 30-50KGy, and carrying out hot water resistance test after irradiation.
TABLE 1 examples 1-4 and comparative examples 1-6 parts by weight of the components
The results of the performance tests of examples 1-4 and comparative examples 1-6 are shown in Table 2.
Table 2 test results for examples 1-4 and comparative examples 1-6
As can be seen from examples 1-4 and comparative examples 1-6 of Table 2, with the addition of citric acid monohydrate, the fluidity of the material was significantly improved, the citric acid monohydrate content was increased, the melt index was improved, and when the citric acid monohydrate content reached 6 parts, the melt index was continuously added with little change. With increasing citric acid monohydrate content, the chain-breaking tensile strain of the meltblown nonwoven fabric becomes correspondingly smaller, and when the content is 6 parts, the tensile strain at break becomes smaller, the meltblown fabric becomes brittle, and preferably the citric acid monohydrate content is 2 to 4 parts. The addition of chitosan alone did not have a significant effect on the flowability of the material, and increased chitosan content affected the toughness of the meltblown and resulted in embrittlement, as can be seen from examples 4 and comparative example 6, as the chitosan increased from 3 parts to 4 parts, the tensile strain at break was reduced by nearly half.
TABLE 3 Hot Water shrinkage after irradiation of melt blown webs of examples 1-4 and comparative example 2 at different irradiation doses
| Dose of irradiation | Hot water shrinkage (longitudinal) of melt-blown fabric | Hot water shrinkage rate of melt-blown fabric (transverse) | |
| Example 1 | 30 KGy | 9.2% | 17.3% |
| Example 1 | 40 KGy | 4.6% | 12.1% |
| Example 1 | 50 KGy | 3.8% | 4.4% |
| Example 2 | 30 KGy | 10.2% | 19.7% |
| Example 3 | 30 KGy | 12.1% | 18.7% |
| Example 4 | 30 KGy | 6.8% | 13.2% |
| Example 4 | 40 KGy | 4.1% | 6.6% |
| Example 4 | 50 KGy | 2.1% | 3.2% |
| Comparative example 2 | / | 46.8% | 53.5% |
| Comparative example 2 | 30 KGy | 51.7% | 57.2% |
As can be seen from the heat-resistant water shrinkage rates of examples 1-4 and comparative example 2 in Table 3 after irradiation, no crosslinking occurs after irradiation by adding citric acid monohydrate alone, the heat-resistant water shrinkage is poor, after chitosan is added, the-NH 3 + on the polysaccharide chain and the carboxyl of the citric acid crosslink under irradiation to form a network structure in polylactic acid, the ratio of citric acid monohydrate to chitosan is 2:3, good heat-resistant shrinkage can be achieved when the irradiation dose is 50KGy, and the performance of the melt-blown cloth is reduced due to the excessively high irradiation dose.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (10)
1. The high-fluidity heat-resistant shrinkage polylactic acid material comprises the following raw materials in parts by weight: PLLA: 62-86 parts; PBAT: 10-30 parts of a lubricant; an antioxidant: 0.2-0.5 parts; nucleating agent: 0.5-1.5 parts; citric acid: 2-4 parts of a lubricant; chitosan: 1-3 parts.
2. The high-fluidity heat-resistant polylactic acid material according to claim 1, wherein the polylactic acid melt is PLLA of 5-20 g/10 min.
3. The high-fluidity heat-resistant polylactic acid-receiving material according to claim 1 or 2, wherein the nucleating agent is an organic and/or inorganic substance capable of promoting rapid crystallization of polylactic acid.
4. The high-fluidity heat-resistant polycondensation lactic acid material according to claim 1 or 2, wherein the nucleating agent is a compound of an amide derivative and a hydrazide compound.
5. The high-fluidity heat-resistant polycondensation lactic acid material according to claim 1 or 2, wherein the antioxidants are a hindered phenol-based main antioxidant and a phosphite-based antioxidant.
6. The high-fluidity heat-resistant polylactic acid material according to claim 1 or 2, wherein the degree of deacetylation of chitosan is not less than 87%.
7. A heat-resistant shrinkage meltblown fabric prepared from the material according to any one of claims 1-6, wherein the preparation step of the heat-resistant shrinkage meltblown fabric comprises: the raw materials are evenly blended according to the proportion and then melt-blended through a double-screw extruder to obtain crosslinkable high-fluidity particles, the obtained granules are melt-blown to obtain melt-blown non-woven fabric, and the non-woven fabric is subjected to irradiation crosslinking treatment to finally obtain the heat-shrinkage-resistant melt-blown fabric.
8. A heat resistant, shrink meltblown web according to claim 7, wherein the radiation crosslinking treatment is by X-rays, electron beams or gamma rays.
9. The heat-resistant shrinkage melt-blown fabric of claim 7, wherein the irradiation crosslinking treatment has an irradiation dose of 30-50 kgy.
10. A heat resistant, shrink meltblown web according to claim 7, wherein the meltblowing process parameters are: melt-blown spinning temperature setting: 170-220 ℃, hot air temperature: 260-280 ℃, and draft wind pressure: 0.02-0.03 MPa.
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| CN107304287A (en) * | 2016-04-22 | 2017-10-31 | 汉达精密电子(昆山)有限公司 | High heat-resisting high fluidity polylactic acid resin composition |
| CN111748184A (en) * | 2020-07-21 | 2020-10-09 | 苏州环诺新材料科技有限公司 | Fully-degradable high-fluidity PLA composite material and preparation method thereof |
| CN112300417A (en) * | 2020-10-30 | 2021-02-02 | 安徽元琛环保科技股份有限公司 | Kettle type synthesis method of polylactic acid with high melting index and prepared modified polylactic acid |
| CN112552663A (en) * | 2020-12-08 | 2021-03-26 | 上海通原环保科技有限公司 | High-fluidity flame-retardant polylactic acid composite material |
| CN114989590A (en) * | 2022-07-19 | 2022-09-02 | 中广核俊尔(浙江)新材料有限公司 | High-fluidity polylactic acid material |
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